Felice gilakdimt



F. GILARDINI.

BELT.

APPLICATION FILED APR. 6. I918.

Patented uly 8, 1919.

I ings, and to letters or figures of reference UNiTED STATES PATENT OFFICE.

FELICE GILABDINI, OF TURIN, ITALY.

BELT.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed April 6, 1918. Serial No. 227,051

. To all whom it may concern:

Be it known that I, FELICE GILARDINI, tanner, a subject of the King of Italy, residing at and Whose post-oflice address is 5 Via Giannone, Turin, inthe Kingdom of .Italy, have invented certain new and useful Improvements in Belts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawrow parts, which are unprepared but highly compressed, the tanning and compresslon operation being eflected while the hides or skins are kept under the utmost tension. It would also be possible to obtain a belt having the above named qualities by superficially tanning the parts extending between the tanned ones with fats or the like, in order that the belt may be used advantageously even in wet places. For the same purpose it v would be advantageous to soak the skin, before stretching it, in a tan liquor, preferably constituted by a mineral solution, which penetrates in a very small quantity the flesh as well as the hair side of the skin.

This belt is illustrated, by way of example and diagrammatically in the annexed drawmg view and a section of the belt, in which the tanned parts are circular; Figs. 3 nd 4 are similar views of a belt of the present type, in which the tanned parts are of rectangular ',form;Figs. 5 and 6 show belts of the present type put on a pulley in order to show their advantages.

The rectangular piece of the skin called the butt is used for this belt, as it is the general rule in the processes already known when belts of good quality are to be pro- I igures 1 and 2 are respectively a plan duced. Said butt isobtained in the usual manner by cutting a rectangular piece in the best and central part of the raw skin.

The butt, either in one piece or cut, as it is preferable, in two, three or more lengths is placed in a stretching device, drawn to the utmost tension and kept in this condition. Said device may be constituted for instance by a rod, on which are fitted two vises, one

of which is stationary while the other is.

movable, said vises being connected with the two hooks of an ordinary stretching apparatus. By causing the screw acting on the hook connected with the movable vise to rotate, this latter is moved from the stationary vise, drawing out the hide or skin until the utmost elongation is obtained. The bolts that fasten the movable vise on the rod are then screwed in, thus preventing the hide or skin from shrinking when the rod with the' two vises, between which the hide, is stretched, is removed from the stretching apparatus. On both sides of the butt, thus maintained in a stretched condition, two I grates with corresponding-openings. are then applied.

Said grates must be disposed one on the hair and the other on the flesh side of the butt, and will be secured by suitable means in order to highly compress all the parts of theskin comprised between the corresponding. openings of the two grates. The frame, constituted by the skin drawn between the grates and the vises, is"after-.

90 in any of the well known, processes. I may,

Ward removed and the tannage carried out for instance, put a series of frames'thus formed in pits, or to hasten the completion of the operation, in series of drums by placing them in layers or, still better, on a revolving support, the rectangular arms of which turning in the liquor, are constituted by the said frames.

v The tannage of said butts may be carried on more rapidly and therefore more advantageously in the apparatus forming the subject matter of my application filed April -6, 191-8, Serial Number 227,050. By using said apparatus, an instantaneous tanning is effected, the tanned parts having any desired form.(for instance, square, rectangular, circular, triangular, etc.) according to the .form of the cells of the machine plates, which must be reduced to the number of two, one plate being placed above the other.

The skin must be maintained drawn between Washing with running water will be carried on, the hides being still kept in the stretched condition; thereupon the gradual drying operation will take place, further the dressing and thenthe treatment with grease, using the usual substances (for instance, oils, degras, tallow and the like) either by soaking or preferably by stufiing or in any other known way. The hides are then slowly dried until quite dry and finally taken olf the frame and hammered, or, preferably, rolled. The manufacture of the belts obtained from this leather will then take place in the usual way, cutting the butts in more or less wide strips according to the desired thickness and size of the belts and effect-mg the several following well known operations.

The belts obtained by this process are" therefore constituted by tanned parts separated by unprepared but strongly oompressed parts. Now it is well'known that the unprepared but strongly compressed hide or skin acquires a high resistance, equal to 7 and 8 K. per mm of breaking load, While the tanned skin has a maximum tensile strength of. 3 to 3% K. per mm and undergoes a remarkable elongation. As the tanned parts this belt are separated by unprepared, ones, the belt will not be stretched in a noticeable degree, owin to} the stiffness of the unprepared parts, wiiile the pliancy of the tanned parts will allow the fitting of the .belt on the pulleys, as it appears clearly from Figs. 5 and 6; more-f over the belts have a greater tensile strength than the belts known heretofore.

This belt shows moreover the advantage of aproper grip of the pulley produced by the tanned parts which are of a greater.

Figs. 2, 3, 5, 6); its working may be compared to a Galls chain or similar chain having numerous links joined side by side, the

unprepared parts, but in such away that a tanned part on one side corresponds'more or less with an unprepared parton the other side.

Hides or skins .tanned according to this process may be used for any other purpose beyond that here mentioned for the manufacture of belts. a

What I claim is: 1. A one ply belt having tanned portions separated by untanned portions.

2. A single and untanned portions.

3. A single ply leather belt having tanned portions,- and compressed untanned portions separating the tanned portions.

ply leather belt having tanned 4; A belt having shaped, pliable, tanned thick portions surrounded by untanned portions thinner than the tanned rtions.

5 A belt for the transmisslon of motion 'in machinery having shaped pliable tanned portions, separated by compressed, still, highly resistant and superficially treated portions thinner than the tanned portions.

- In testimony that I claim the foregoing as my invention, 1 have signed my name.

'FELIGE G'ILARDIN-I.

thickness than the unprepared ones (see 45' 

